Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 2, pages 67-97
Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 2, pages 97-115
Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 2, pages 115-121
Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 2, pages 121-146
Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 1, pages 32-43
Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 1, pages 44-60
Published in Journal of The Arnold Arboretum, in 1919, in volume 1, issue 1, pages 61-65